A box contains 60 apples if 1/5 of the apples are rotten what percent of the apples are rotten
If 1/5 of the apples are rotten, then the number of rotten apples is (1/5)*60 = <<(1/5)*60=12>>12.
To find the percentage, we divide the number of rotten apples by the total number of apples and multiply by 100: (12/60)*100 = 20%.
Thus, 20% of the apples are rotten. Answer: \boxed{20}.